in this study, a hierarchical hub location problem by considering different modes of transportation and maximum allowed delay is investigated. this study is done on iran’s express postal service with 2 days maximum delay in delivery considering ground and airport hubs. the problem is of the type of location and single allocation for collection, transfer and distribution of the shipments. all th...

Wireless Local Area Networks (WLAN) do not only provide a means for wireless communication, they can also supply terminal positions to location-aware services and applications. This paper presents a location-aware mobile learning platform and its underlying location service. The system extracts sensor data from a universitywide WLAN infrastructure to determine user locations.

An expressive representation for location is an important component in many applications. However, current location representations model only the geographical aspects of a place. While this is a necessary feature to capture, it is far from sufficient. As a result, many location-aware applications only reason about space at the level of coordinates and containment relationships, but have no way...

Location-based services (LBS) become more feature-rich and versatile due to the explosion of mobile devices and the advances of positioning technologies. However, revealing personal private locations to potentially un-trusted LBS server and others may raise serious privacy concerns if these locations are not protected adequately. In this paper, we present a survey of existing methods dealing wi...

The blooming of location-sharing services has led to serious privacy concerns, particularly location privacy concerns. In this paper, we first discuss the definition of location privacy and then review several location privacy protection mechanisms. After that, we classify location privacy protection mechanisms into four categories: legislation & regulatory, anonymity & obfuscation, protocol an...

Learning and studying are very often connected with reading printed materials. In this paper we describe some implementation issues of a common task – printing a document, when applied in a mobile environment. In a non-mobile context this task is simple and is usually taken for granted, but the introduction of a palmtop/laptop equipped with a wireless-LAN card makes the task less trivial. To fu...